Character Astrology, or Cass & Andy, by the numbers

Do you know the birthdays of your favorite fictional characters? I admit that with the exception of Harry Potter, I do not. Most authors don't include that detail. Maybe most authors don't think in those terms--fictional birthdays for fictional people. What does it matter if my protagonist is a Capricorn or a Taurus? Probably nothing, since astrology is just one of many systems people have created to try to make sense out of a nonsensical universe. But, as a person who loves